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/*

 * Copyright (c) 1980 Regents of the University of California.

 * All rights reserved.  The Berkeley software License Agreement

 * specifies the terms and conditions for redistribution.

 */

#if	!defined(lint) && defined(DOSCCS)

static char *sccsid = "@(#)ex_vwind.c	7.3 (Berkeley) 6/7/85";

#endif

#include "ex.h"

#include "ex_tty.h"

#include "ex_vis.h"

/*

 * Routines to adjust the window, showing specified lines

 * in certain positions on the screen, and scrolling in both

 * directions.  Code here is very dependent on mode (open versus visual).

 */

/*

 * Move in a nonlocal way to line addr.

 * If it isn't on screen put it in specified context.

 * New position for cursor is curs.

 * Like most routines here, we vsave().

 */

vmoveto(addr, curs, context)

	register line *addr;

	char *curs;

	char context;

{

	markit(addr);

	vsave();

	vjumpto(addr, curs, context);

}

/*

 * Vjumpto is like vmoveto, but doesn't mark previous

 * context or save linebuf as current line.

 */

vjumpto(addr, curs, context)

	register line *addr;

	char *curs;

	char context;

{

	noteit(0);

	if (context != 0)

		vcontext(addr, context);

	else

		vshow(addr, NOLINE);

	noteit(1);

	vnline(curs);

}

/*

 * Go up or down cnt (negative is up) to new position curs.

 */

vupdown(cnt, curs)

	register int cnt;

	char *curs;

{

	if (cnt > 0)

		vdown(cnt, 0, 0);

	else if (cnt < 0)

		vup(-cnt, 0, 0);

	if (vcnt == 0)

		vrepaint(curs);

	else

		vnline(curs);

}

/*

 * Go up cnt lines, afterwards preferring to be ind

 * logical lines from the top of the screen.

 * If scroll, then we MUST use a scroll.

 * Otherwise clear and redraw if motion is far.

 */

vup(cnt, ind, scroll)

	register int cnt, ind;

	bool scroll;

{

	register int i, tot;

	if (dot == one) {

		beep();

		return;

	}

	vsave();

	i = lineDOT() - 1;

	if (cnt > i) {

		ind -= cnt - i;

		if (ind < 0)

			ind = 0;

		cnt = i;

	}

	if (!scroll && cnt <= vcline) {

		vshow(dot - cnt, NOLINE);

		return;

	}

	cnt -= vcline, dot -= vcline, vcline = 0;

	if (hold & HOLDWIG)

		goto contxt;

	if (state == VISUAL && !AL && !SR &&

	    cnt <= WTOP - ZERO && vfit(dot - cnt, cnt) <= WTOP - ZERO)

		goto okr;

	tot = WECHO - ZERO;

	if (state != VISUAL || (!AL && !SR) || (!scroll && (cnt > tot || vfit(dot - cnt, cnt) > tot / 3 + 1))) {

		if (ind > basWLINES / 2)

			ind = basWLINES / 3;

contxt:

		vcontext(dot + ind - cnt, '.');

		return;

	}

okr:

	vrollR(cnt);

	if (scroll) {

		vcline += ind, dot += ind;

		if (vcline >= vcnt)

			dot -= vcline - vcnt + 1, vcline = vcnt - 1;

		getDOT();

	}

}

/*

 * Like vup, but scrolling down.

 */

vdown(cnt, ind, scroll)

	register int cnt, ind;

	bool scroll;

{

	register int i, tot;

	if (dot == dol) {

		beep();

		return;

	}

	vsave();

	i = dol - dot;

	if (cnt > i) {

		ind -= cnt - i;

		if (ind < 0)

			ind = 0;

		cnt = i;

	}

	i = vcnt - vcline - 1;

	if (!scroll && cnt <= i) {

		vshow(dot + cnt, NOLINE);

		return;

	}

	cnt -= i, dot += i, vcline += i;

	if (hold & HOLDWIG)

		goto dcontxt;

	if (!scroll) {

		tot = WECHO - ZERO;

		if (state != VISUAL || cnt - tot > 0 || vfit(dot, cnt) > tot / 3 + 1) {

dcontxt:

			vcontext(dot + cnt, '.');

			return;

		}

	}

	if (cnt > 0)

		vroll(cnt);

	if (state == VISUAL && scroll) {

		vcline -= ind, dot -= ind;

		if (vcline < 0)

			dot -= vcline, vcline = 0;

		getDOT();

	}

}

/*

 * Show line addr in context where on the screen.

 * Work here is in determining new top line implied by

 * this placement of line addr, since we always draw from the top.

 */

vcontext(addr, where)

	register line *addr;

	char where;

{

	register line *top;

	ex_getline(*addr);

	if (state != VISUAL)

		top = addr;

	else switch (where) {

	case '^':

		addr = vback(addr, basWLINES - vdepth());

		ex_getline(*addr);

		/* fall into ... */

	case '-':

		top = vback(addr, basWLINES - vdepth());

		ex_getline(*addr);

		break;

	case '.':

		top = vback(addr, basWLINES / 2 - vdepth());

		ex_getline(*addr);

		break;

	default:

		top = addr;

		break;

	}

	if (state == ONEOPEN && LINE(0) == WBOT)

		vup1();

	vcnt = vcline = 0;

	vclean();

	if (state == CRTOPEN)

		vup1();

	vshow(addr, top);

}

/*

 * Get a clean line.  If we are in a hard open

 * we may be able to reuse the line we are on

 * if it is blank.  This is a real win.

 */

vclean()

{

	if (state != VISUAL && state != CRTOPEN) {

		destcol = 0;

		if (!ateopr())

			vup1();

		vcnt = 0;

	}

}

/*

 * Show line addr with the specified top line on the screen.

 * Top may be 0; in this case have vcontext compute the top

 * (and call us recursively).  Eventually, we clear the screen

 * (or its open mode equivalent) and redraw.

 */

vshow(addr, top)

	line *addr, *top;

{

#ifndef CBREAK

	register bool fried = 0;

#endif

	register int cnt = addr - dot;

	register int i = vcline + cnt;

	short oldhold = hold;

#ifdef ADEBUG

	if (trace)

		tfixnl(), fprintf(trace, "vshow(%d)\n", 123), tvliny();

#endif

	if (state != HARDOPEN && state != ONEOPEN && i >= 0 && i < vcnt) {

		dot = addr;

		getDOT();

		vcline = i;

		return;

	}

	if (state != VISUAL) {

		dot = addr;

		vopen(dot, WBOT);

		return;

	}

	if (top == 0) {

		vcontext(addr, '.');

		return;

	}

	dot = top;

#ifndef CBREAK

	if (vcookit(2))

		fried++, vcook();

#endif

	oldhold = hold;

	hold |= HOLDAT;

	vclear();

	vreset(0);

	vredraw(WTOP);

	/* error if vcline >= vcnt ! */

	vcline = addr - top;

	dot = addr;

	getDOT();

	hold = oldhold;

	vsync(LASTLINE);

#ifndef CBREAK

	if (fried)

		flusho(), vraw();

#endif

}

/*

 * reset the state.

 * If inecho then leave us at the beginning of the echo

 * area;  we are called this way in the middle of a :e escape

 * from visual, e.g.

 */

vreset(inecho)

	bool inecho;

{

	vcnt = vcline = 0;

	WTOP = basWTOP;

	WLINES = basWLINES;

	if (inecho)

		splitw = 1, vgoto(WECHO, 0);

}

/*

 * Starting from which line preceding tp uses almost (but not more

 * than) cnt physical lines?

 */

line *

vback(tp, cnt)

	register int cnt;

	register line *tp;

{

	register int d;

	if (cnt > 0)

		for (; tp > one; tp--) {

			ex_getline(tp[-1]);

			d = vdepth();

			if (d > cnt)

				break;

			cnt -= d;

		}

	return (tp);

}

/*

 * How much scrolling will it take to roll cnt lines starting at tp?

 */

vfit(tp, cnt)

	register line *tp;

	int cnt;

{

	register int j;

	j = 0;

	while (cnt > 0) {

		cnt--;

		ex_getline(tp[cnt]);

		j += vdepth();

	}

	if (tp > dot)

		j -= WBOT - LASTLINE;

	return (j);

}

/*

 * Roll cnt lines onto the screen.

 */

vroll(cnt)

	register int cnt;

{

#ifndef CBREAK

	register bool fried = 0;

#endif

	short oldhold = hold;

#ifdef ADEBUG

	if (trace)

		tfixnl(), fprintf(trace, "vroll(%d)\n", cnt);

#endif

	if (state != VISUAL)

		hold |= HOLDAT|HOLDROL;

	if (WBOT == WECHO) {

		vcnt = 0;

		if (state == ONEOPEN)

			vup1();

	}

#ifndef CBREAK

	if (vcookit(cnt))

		fried++, vcook();

#endif

	for (; cnt > 0 && Peekkey != ATTN; cnt--) {

		dot++, vcline++;

		vopen(dot, LASTLINE);

		vscrap();

	}

	hold = oldhold;

	if (state == HARDOPEN)

		sethard();

	vsyncCL();

#ifndef CBREAK

	if (fried)

		flusho(), vraw();

#endif

}

/*

 * Roll backwards (scroll up).

 */

vrollR(cnt)

	register int cnt;

{

	register bool fried = 0;

	short oldhold = hold;

#ifdef ADEBUG

	if (trace)

		tfixnl(), fprintf(trace, "vrollR(%d), dot=%d\n", cnt, lineDOT());

#endif

#ifndef CBREAK

	if (vcookit(cnt))

		fried++, vcook();

#endif

	if (WBOT == WECHO)

		vcnt = 0;

	heldech = 0;

	hold |= HOLDAT|HOLDECH;

	for (; cnt > 0 && Peekkey != ATTN; cnt--) {

		dot--;

		vopen(dot, WTOP);

		vscrap();

	}

	hold = oldhold;

	if (heldech)

		vclrech(0);

	vsync(LINE(vcnt-1));

#ifndef CBREAK

	if (fried)

		flusho(), vraw();

#endif

}

/*

 * Go into cooked mode (allow interrupts) during

 * a scroll if we are at less than 1200 baud and not

 * a 'vi' command, of if we are in a 'vi' command and the

 * scroll is more than 2 full screens.

 *

 * BUG:		An interrupt during a scroll in this way

 *		dumps to command mode.

 */

vcookit(cnt)

	register int cnt;

{

	return (cnt > 1 && (o_speed < B1200 && !initev || cnt > LINES * 2));

}

/*

 * Determine displayed depth of current line.

 */

vdepth()

{

	register int d;

	d = (column(NOSTR) + WCOLS - 1 + (Putchar == listchar) + IN) / WCOLS;

#ifdef ADEBUG

	if (trace)

		tfixnl(), fprintf(trace, "vdepth returns %d\n", d == 0 ? 1 : d);

#endif

	return (d == 0 ? 1 : d);

}

/*

 * Move onto a new line, with cursor at position curs.

 */

vnline(curs)

	char *curs;

{

	if (curs)

		wcursor = curs;

	else if (vmoving)

		wcursor = vfindcol(vmovcol);

	else

		wcursor = vskipwh(linebuf);

	cursor = linebuf;

	vmove();

}